Car Myths #33: Secret tech gives cars up to 200 MPGs By Frank-Ling / Apr 17, 2014 share Facebook Twitter Google + LinkedIn Pinterest Email Share... By Frank LingThis story has become an urban legend and has been told and retold in different forms and settings.But the main story starts with someone buying a car off the car lot and noticing that the gas gauge doesn’t move even after a hundred miles. The tank seems to be almost full and the person driving the car inspects under the hood.He sees a mysterious black box that is attached to the engine and assumes it is a device that was accidentally released by the car manufacturer. This tech has been hidden from the public by the oil companies. True or not?The story continuesSoon after the discovery of the super gas gadget, he is visited by representatives of the manufacturer of the car. The reps promise him any top-of-the-line car he wants in exchange for a signed non-disclosure agreement and the return the super gas car.We wishIf there was such a magic box, it would solve the world’s energy dependency on oil for many countries. But as good as this story sounds, and no matter how authentic the details seem to be, it is nothing more than a fabrication.Besides, if the man really signed a non-disclosure agreement, how did the story get out in the first place?But in any event, the story is a popular one that seems to pop up every time there is a big spike in gasoline prices.As for any gas improving gadgets that promise better MPGs for your car, forget about all of them. The EPA has done extensive tests on these products over the decades and has come to one conclusion: none of them work.Source: AIADA